The ISL22102 integrates two digitally controlledpotentiometers (DCP) with buffered wiper outputs and aninternal bias voltage generator (VB) on a monolithic CMOSintegrated circuit. The wiper position is adjusted by the userthrough simple Up and Down push buttons, ideal for stereovolume control in audio applications.Each potentiometer is implemented using 31 polysiliconresistors in a logarithmic array. Between each of theresistors are tap points connected to the wiper terminalthrough switches. When powered up, the wipers are reset tothe -20dB position.In addition to the ISL22102’s low noise design, the ISL22102also contains a zero-crossing detection circuitry to furtherminimize click and pop noise during volume transition.The internal VB generator of the ISL22102 provides aprecision middle scale voltage reference that reducesexternal circuitry and simplifies application design.